Clamp



FIG. 1 is a perspective view of a clamp showing my new design;

FIG. 2 is a top plan view of the invention;

FIG. 3 is a side view of the invention (the left and right side views are mirror images);

FIG. 4 is a bottom view of the invention;

FIG. 5 is a front view of the invention; and,

FIG. 6 is a rear view of the invention. 

The ornamental design for a clamp, as shown and described. 